Comfort and protectionThe ultra soft breast shells are worn inside your bra to protect your nipples from chafing and to collect leaking breast milk. * Protect sore nipples* Ventilated shells - protect sore or cracked nipples to help them heal more quickly. Their gentle pressure helps relieve engorgement. The holes allow air to circulate. * Help ease engorgement * Collect excess breast milk* Breast milk collection shells (no holes) - collect excess breast milk when feeding or using a breast pump.